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/*
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*
* // Copyright (c) 1998, 2007, Oracle. All rights reserved.
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package oracle.toplink.essentials.internal.databaseaccess;
import java.io.*;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.sequencing.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.sessions.DatabaseSession;
/**
* DatasourcePlatform is private to TopLink. It encapsulates behavior specific to a datasource platform
* (eg. Oracle, Sybase, DB2, Attunity, MQSeries), and provides protocol for TopLink to access this behavior.
*
* @see DatabasePlatform
* @see oracle.toplink.essentials.eis.EISPlatform
* @see oracle.toplink.essentials.xml.XMLPlatform
* @see oracle.toplink.essentials.sdk.SDKPlatform
*
* @since OracleAS TopLink 10g (10.0.3)
*/
public class DatasourcePlatform implements Platform {
/** Supporting name scopes in database by prefixing the table names with the table qualifier/creator. */
protected String tableQualifier;
/** Allow for conversion to be customized in the platform. */
protected transient ConversionManager conversionManager;
/** Store the query use to query the current server time. */
protected ValueReadQuery timestampQuery;
/** Operators specific to this platform */
protected transient Map platformOperators;
/** Store the list of Classes that can be converted to from the key. */
protected Hashtable dataTypesConvertedFromAClass;
/** Store the list of Classes that can be converted from to the key. */
protected Hashtable dataTypesConvertedToAClass;
/** Store default sequence */
protected Sequence defaultSequence;
/** Store map of sequence names to sequences */
protected Map sequences;
public DatasourcePlatform() {
this.tableQualifier = "";
}
protected void addOperator(ExpressionOperator operator) {
platformOperators.put(new Integer(operator.getSelector()), operator);
}
/**
* Add the parameter.
* Convert the parameter to a string and write it.
*/
public void appendParameter(Call call, Writer writer, Object parameter) {
String parameterValue = (String)getConversionManager().convertObject(parameter, ClassConstants.STRING);
if (parameterValue == null) {
parameterValue = "";
}
try {
writer.write(parameterValue);
} catch (IOException exception) {
throw ValidationException.fileError(exception);
}
}
/**
* Allow for the platform to handle the representation of parameters specially.
*/
public Object getCustomModifyValueForCall(Call call, Object value, DatabaseField field, boolean shouldBind) {
return value;
}
/**
* Used by SQLCall.appendModify(..)
* If the field should be passed to customModifyInDatabaseCall, retun true,
* otherwise false.
* Methods shouldCustomModifyInDatabaseCall and customModifyInDatabaseCall should be
* kept in sync: shouldCustomModifyInDatabaseCall should return true if and only if the field
* is handled by customModifyInDatabaseCall.
*/
public boolean shouldUseCustomModifyForCall(DatabaseField field) {
return false;
}
public Object clone() {
try {
DatasourcePlatform clone = (DatasourcePlatform)super.clone();
clone.sequencesAfterCloneCleanup();
return clone;
} catch (CloneNotSupportedException exception) {
;//Do nothing
}
return null;
}
protected void sequencesAfterCloneCleanup() {
Sequence defaultSequenceClone = null;
if (hasDefaultSequence()) {
defaultSequenceClone = (Sequence)getDefaultSequence().clone();
setDefaultSequence(defaultSequenceClone);
}
HashMap sequencesDeepClone = null;
if (getSequences() != null) {
sequencesDeepClone = new HashMap(getSequences().size());
Iterator it = getSequences().values().iterator();
while (it.hasNext()) {
Sequence sequence = (Sequence)it.next();
if ((defaultSequenceClone != null) && (sequence == getDefaultSequence())) {
sequencesDeepClone.put(defaultSequenceClone.getName(), defaultSequenceClone);
} else {
Sequence sequenceClone = (Sequence)sequence.clone();
if (sequenceClone instanceof DefaultSequence) {
if (!((DefaultSequence)sequenceClone).hasPreallocationSize()) {
continue;
}
}
sequencesDeepClone.put(sequenceClone.getName(), sequenceClone);
}
}
this.setSequences(sequencesDeepClone);
}
}
/**
* Convert the object to the appropriate type by invoking the appropriate
* ConversionManager method
* @param object - the object that must be converted
* @param javaClass - the class that the object must be converted to
* @exception - ConversionException, all exceptions will be thrown as this type.
* @return - the newly converted object
*/
public Object convertObject(Object sourceObject, Class javaClass) throws ConversionException {
return getConversionManager().convertObject(sourceObject, javaClass);
}
/**
* Copy the state into the new platform.
*/
public void copyInto(Platform platform) {
if (!(platform instanceof DatasourcePlatform)) {
return;
}
DatasourcePlatform datasourcePlatform = (DatasourcePlatform)platform;
datasourcePlatform.setTableQualifier(getTableQualifier());
datasourcePlatform.setTimestampQuery(this.timestampQuery);
datasourcePlatform.setConversionManager(getConversionManager());
if (hasDefaultSequence()) {
datasourcePlatform.setDefaultSequence(getDefaultSequence());
}
datasourcePlatform.setSequences(getSequences());
datasourcePlatform.sequencesAfterCloneCleanup();
}
/**
* The platform hold its own instance of conversion manager to allow customization.
*/
public ConversionManager getConversionManager() {
// Lazy init for serialization.
if (conversionManager == null) {
//Clone the default to allow customers to easily override the conversion manager
conversionManager = (ConversionManager)ConversionManager.getDefaultManager().clone();
}
return conversionManager;
}
/**
* The platform hold its own instance of conversion manager to allow customization.
*/
public void setConversionManager(ConversionManager conversionManager) {
this.conversionManager = conversionManager;
}
/**
* Return the operator for the operator constant defined in ExpressionOperator.
*/
public ExpressionOperator getOperator(int selector) {
return (ExpressionOperator)getPlatformOperators().get(new Integer(selector));
}
/**
* Return any platform-specific operators
*/
public synchronized Map getPlatformOperators() {
if (platformOperators == null) {
initializePlatformOperators();
}
return platformOperators;
}
public int getSequencePreallocationSize() {
return getDefaultSequence().getPreallocationSize();
}
/**
* Return the qualifier for the table. Required by some
* databases such as Oracle and DB2
*/
public String getTableQualifier() {
return tableQualifier;
}
/**
* Answer the timestamp from the server.
*/
public java.sql.Timestamp getTimestampFromServer(AbstractSession session, String sessionName) {
if (getTimestampQuery() == null) {
return new java.sql.Timestamp(System.currentTimeMillis());
} else {
getTimestampQuery().setSessionName(sessionName);
return (java.sql.Timestamp)session.executeQuery(getTimestampQuery());
}
}
/**
* This method can be overridden by subclasses to return a
* query that will return the timestamp from the server.
* return null if the time should be the local time.
*/
public ValueReadQuery getTimestampQuery() {
return timestampQuery;
}
/**
* Initialize any platform-specific operators
*/
protected void initializePlatformOperators() {
this.platformOperators = new HashMap();
// Outer join
addOperator(ExpressionOperator.equalOuterJoin());
// General
addOperator(ExpressionOperator.toUpperCase());
addOperator(ExpressionOperator.toLowerCase());
addOperator(ExpressionOperator.chr());
addOperator(ExpressionOperator.concat());
addOperator(ExpressionOperator.hexToRaw());
addOperator(ExpressionOperator.initcap());
addOperator(ExpressionOperator.instring());
addOperator(ExpressionOperator.soundex());
addOperator(ExpressionOperator.leftPad());
addOperator(ExpressionOperator.leftTrim());
addOperator(ExpressionOperator.leftTrim2());
addOperator(ExpressionOperator.replace());
addOperator(ExpressionOperator.rightPad());
addOperator(ExpressionOperator.rightTrim());
addOperator(ExpressionOperator.rightTrim2());
addOperator(ExpressionOperator.substring());
addOperator(ExpressionOperator.toNumber());
addOperator(ExpressionOperator.toChar());
addOperator(ExpressionOperator.toCharWithFormat());
addOperator(ExpressionOperator.translate());
addOperator(ExpressionOperator.trim());
addOperator(ExpressionOperator.trim2());
addOperator(ExpressionOperator.ascii());
addOperator(ExpressionOperator.length());
addOperator(ExpressionOperator.locate());
addOperator(ExpressionOperator.locate2());
// Date
addOperator(ExpressionOperator.addMonths());
addOperator(ExpressionOperator.dateToString());
addOperator(ExpressionOperator.lastDay());
addOperator(ExpressionOperator.monthsBetween());
addOperator(ExpressionOperator.nextDay());
addOperator(ExpressionOperator.roundDate());
addOperator(ExpressionOperator.toDate());
addOperator(ExpressionOperator.today());
addOperator(ExpressionOperator.currentDate());
addOperator(ExpressionOperator.currentTime());
// Math
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Add, "+"));
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Subtract, "-"));
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Multiply, "*"));
addOperator(ExpressionOperator.simpleMath(ExpressionOperator.Divide, "/"));
addOperator(ExpressionOperator.ceil());
addOperator(ExpressionOperator.cos());
addOperator(ExpressionOperator.cosh());
addOperator(ExpressionOperator.abs());
addOperator(ExpressionOperator.acos());
addOperator(ExpressionOperator.asin());
addOperator(ExpressionOperator.atan());
addOperator(ExpressionOperator.exp());
addOperator(ExpressionOperator.sqrt());
addOperator(ExpressionOperator.floor());
addOperator(ExpressionOperator.ln());
addOperator(ExpressionOperator.log());
addOperator(ExpressionOperator.mod());
addOperator(ExpressionOperator.power());
addOperator(ExpressionOperator.round());
addOperator(ExpressionOperator.sign());
addOperator(ExpressionOperator.sin());
addOperator(ExpressionOperator.sinh());
addOperator(ExpressionOperator.tan());
addOperator(ExpressionOperator.tanh());
addOperator(ExpressionOperator.trunc());
addOperator(ExpressionOperator.greatest());
addOperator(ExpressionOperator.least());
// Object-relational
addOperator(ExpressionOperator.deref());
addOperator(ExpressionOperator.ref());
addOperator(ExpressionOperator.refToHex());
addOperator(ExpressionOperator.value());
}
public boolean isAccess() {
return false;
}
public boolean isAttunity() {
return false;
}
public boolean isCloudscape() {
return false;
}
public boolean isDerby() {
return false;
}
public boolean isDB2() {
return false;
}
public boolean isDBase() {
return false;
}
public boolean isHSQL() {
return false;
}
public boolean isInformix() {
return false;
}
public boolean isMySQL() {
return false;
}
public boolean isODBC() {
return false;
}
public boolean isOracle() {
return false;
}
public boolean isPointBase() {
return false;
}
public boolean isSQLAnywhere() {
return false;
}
public boolean isSQLServer() {
return false;
}
public boolean isSybase() {
return false;
}
public boolean isTimesTen() {
return false;
}
public boolean isPostgreSQL() {
return false;
}
/**
* Set the qualifier for the table. Required by some
* databases such as Oracle and DB2
*/
public void setTableQualifier(String qualifier) {
tableQualifier = qualifier;
}
/**
* Can override the default query for returning a timestamp from the server.
* See: getTimestampFromServer
*/
public void setTimestampQuery(ValueReadQuery tsQuery) {
timestampQuery = tsQuery;
}
public String toString() {
return Helper.getShortClassName(this.getClass());
}
/**
* PUBLIC:
* Return the list of Classes that can be converted to from the passed in javaClass.
* @param javaClass - the class that is converted from
* @return - a vector of classes
*/
public Vector getDataTypesConvertedFrom(Class javaClass) {
return getConversionManager().getDataTypesConvertedFrom(javaClass);
}
/**
* PUBLIC:
* Return the list of Classes that can be converted from to the passed in javaClass.
* @param javaClass - the class that is converted to
* @return - a vector of classes
*/
public Vector getDataTypesConvertedTo(Class javaClass) {
return getConversionManager().getDataTypesConvertedTo(javaClass);
}
/**
* Get default sequence
*/
public Sequence getDefaultSequence() {
if (!hasDefaultSequence()) {
setDefaultSequence(createPlatformDefaultSequence());
}
return defaultSequence;
}
/**
* Get default sequence
*/
public boolean hasDefaultSequence() {
return defaultSequence != null;
}
/**
* Set default sequence. In case the passed sequence is of type DefaultSequence - use platformDefaultSequence
* with name and size of the passed sequence.
*/
public void setDefaultSequence(Sequence sequence) {
if (sequence instanceof DefaultSequence) {
Sequence platformDefaultSequence = createPlatformDefaultSequence();
if (platformDefaultSequence != null) {
platformDefaultSequence.setName(sequence.getName());
if (((DefaultSequence)sequence).hasPreallocationSize()) {
platformDefaultSequence.setPreallocationSize(sequence.getPreallocationSize());
}
}
defaultSequence = platformDefaultSequence;
} else {
defaultSequence = sequence;
}
}
/**
* Add sequence corresponding to the name
*/
public void addSequence(Sequence sequence) {
if (getSequences() == null) {
createSequences();
}
getSequences().put(sequence.getName(), sequence);
}
/**
* Get sequence corresponding to the name
*/
public Sequence getSequence(String seqName) {
if (seqName == null) {
return getDefaultSequence();
} else {
if (getSequences() != null) {
return (Sequence)getSequences().get(seqName);
} else {
return null;
}
}
}
/**
* INTERNAL:
* Create platform-default Sequence
*/
protected Sequence createPlatformDefaultSequence() {
throw ValidationException.createPlatformDefaultSequenceUndefined(Helper.getShortClassName(this));
}
protected synchronized void createSequences() {
if (getSequences() == null) {
setSequences(new HashMap());
}
}
/**
* Remove sequence corresponding to name.
* Doesn't remove default sequence.
*/
public Sequence removeSequence(String seqName) {
if (getSequences() != null) {
return (Sequence)getSequences().remove(seqName);
} else {
return null;
}
}
/**
* Remove all sequences, but the default one.
*/
public void removeAllSequences() {
sequences = null;
}
/**
* INTERNAL:
* Returns a map of sequence names to Sequences (may be null).
*/
public Map getSequences() {
return sequences;
}
/**
* INTERNAL:
* Used only for writing into XML or Java.
*/
public Map getSequencesToWrite() {
if ((getSequences() == null) || getSequences().isEmpty()) {
return null;
}
Map sequencesToWrite = new HashMap();
Iterator it = getSequences().values().iterator();
while (it.hasNext()) {
Sequence sequence = (Sequence)it.next();
if (!(sequence instanceof DefaultSequence) || ((DefaultSequence)sequence).hasPreallocationSize()) {
sequencesToWrite.put(sequence.getName(), sequence);
}
}
return sequencesToWrite;
}
/**
* INTERNAL:
* Used only for writing into XML or Java.
*/
public Sequence getDefaultSequenceToWrite() {
if (usesPlatformDefaultSequence()) {
return null;
} else {
return getDefaultSequence();
}
}
/**
* INTERNAL:
* Sets sequences - for XML support only
*/
public void setSequences(Map sequences) {
this.sequences = sequences;
}
/**
* INTERNAL:
* Indicates whether defaultSequence is the same as platform default sequence.
*/
public boolean usesPlatformDefaultSequence() {
if (!hasDefaultSequence()) {
return true;
} else {
return getDefaultSequence().equals(createPlatformDefaultSequence());
}
}
}
